1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccd316f676c910d5754fa61358ef93d959ce7afdbd4c08a22e7e4dd678fc5ef6. Chain 2 (Bitcoin): anchored in block 954549 (2026-06-20T10:56:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a820a6da-01f0-449b-80c0-48af433c9874.json and https://artists.proofprofile.net/proofs/artist/a820a6da-01f0-449b-80c0-48af433c9874.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc04c4705dcf94ca5cc592d24c5fd2e2a0853ec1adb1abb7f75dc2f8f92c5e667. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTB22321337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a61540d43ae018e48cd8806779a69e77dc0112b94bfcd4bb2ca2a8039572273. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZWFH2329623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x571d2d301e3ff202544758b2e73c9c9b0fb979eb396654bde7867afb80ad2510. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTBF2445686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fb70065b4e40a5dc0c485277dda5c42a7d4b6f31a536a05c81a10e697342c6a. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBMA22413532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb9a9ee70215005eda7926dea80f8309446aab01f0ab8b641500c323bef1cd7f. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZMEQ2417507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf2dff569008c74ed2f2c12bbb7398c2d4d747d27cb1cfaa1fe8f3dd592ca51f. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZES92442619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce864e1b3c51dd6931447408046c901f2d4d070a947af89b8c885e1a5ece6ef7. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZDA72419918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4df2154b04661896b45732c517ed0cc1ef16dbc84a6528b7d559a2e91f64f8d. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTAX2385283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8c4a00e1d95e8cdf9b6992238213b65fd07e250631196c4a8c3e62d4ab7a70f. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTBA2392422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ac540f3f2c53928b4bfd05ec4ca95ce95cec49261d252c1793b04a878ff34da. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBLFP2409024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5decaea7848aae2d2fcfb0dddc91a082a0bd877442e6a9f431cb91b64d2af98c. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZK6K2393260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6032fd6cd9e600ee7fa18247f219d4f9d4c9482a349e0f6c53972f468cf6f3d8. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZK6K2393261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcbc750648056be22e1c937057ece435270a890b15761590d30ad70dc0c10143. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/UKXN22593679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a61237a157e767e7e65d275716be61376f10554506d1da98fe30c866846489e. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZFYZ2465204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7583d22d10d11856f3991a106af4d5ac77595990f3f9a368d846c6775d418a9. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZFZ22566062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25308fe2531856ca737f6070c1e4ca27c61c6ed6573b59f3ca6caf66a32ac06d. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZFZ22566063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x735236c71bea4e1acc243fc77047854e99856aa2bd8b06179bfc6604540981f5. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZFZ22566064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa03ae38120992f04e0d9ee25144ca6ba3190bf81f0d74454723e8c3acaf831bb. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZFZ22566065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3372027715dd3226c3be6569ae0e02c6ea8a38c285e8a5c985d4331ee0966581. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZFZ22566066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf86090e82ac56eb18a496c39705f1bd1567454e2cb5e1c36858c7bd6eb6fd137. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZFZ22566067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7237e3534faba226f529062a65d76c683f948a740a5e7f35b00d3222054cc623. Chain 2 (Bitcoin): anchored in block 960268 (2026-07-30T14:53:07Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZFZ22566068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a59109dab0094db35e0412668063e146a39eb60243cbcc1c873c7a730c7b095. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZHN32486878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ad2bdaa56cc016764670c34672707899fa4b463eee3a0d9ce933442bf050263. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZMEP2469560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e3d471bdce7488c453ff8dcb45c515c25d35d4bf786ec402fdc1f4de947fb9f. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZWV32471663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7420b323fe7c492373f612d3bbb324d7cab954c646bfcc5e75096119e9dd82a4. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZES82384451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e1cceebbddd958a9d7813d7f46da31e959bf02fc013ca94a49220c46241bc5e. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZ5FN2530418.